nickel zinc
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Molecules ◽  
2021 ◽  
Vol 27 (1) ◽  
pp. 43
Author(s):  
Jitlada Vichapong ◽  
Rawikan Kachangoon ◽  
Rodjana Burakham ◽  
Yanawath Santaladchaiyakit ◽  
Supalax Srijaranai

A single-step preconcentration procedure using the in-situ formation of modified nickel–zinc-layered double hydroxides (LDHs) prior to high-performance liquid chromatography (HPLC) is investigated for the determination of neonicotinoid insecticide residues in honey samples. The LDHs could be prepared by the sequential addition of sodium hydroxide, sodium dodecyl sulfate, nickel nitrate 6-hydrate and zinc nitrate 6-hydrate, which were added to the sample solution. The co-precipitate phase and phase separation were obtained by centrifugation, and then the precipitate phase was dissolved in formic acid (concentrate) prior to HPLC analysis. Various analytical parameters affecting extraction efficiency were studied, and the characterization of the LDHs phase was performed using Fourier-transformed infrared spectroscopy and scanning electron microscopy. Under optimum conditions, the limit of detection of the studied neonicotinoids, in real samples, were 30 μg L−1, for all analytes, lower than the maximum residue limits established by the European Union (EU). The developed method provided high enrichment, by a factor of 35. The proposed method was utilized to determine the target insecticides in honey samples, and acceptable recoveries were obtained.


2021 ◽  
Vol 2 (4) ◽  
pp. 34-39
Author(s):  
Hafza Murtaza ◽  
Aasia Sikander ◽  
Umema Murtaza ◽  
Ashir Masroor ◽  
Filza Ghafoor

In this study, various leaves and stem organic extracts were prepared using the solvents viz., n-hexane, ethyl acetate, ethanol and water, separately. Different phytochemical test for alkaloids, carbohydrates, oils, amino acids and others were performed to determine their presence in the extracts. These plant extracts were used for screening of sample via UV and HPLC techniques to compare the wavelength and absorbance, and retention time on chromatogram by extracts, respectively. The surface properties and size of nickel-zinc nano ferrites were evaluated by Energy-dispersive X-ray spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The former, showed the presence of nickel (Ni) and zinc (Zn) weighing 4.27⁒ of N ,6.89⁒ of C and 35.5⁒ of O in the sample which confirmed the presence of nano ferrites in leaves and stem of C. buchanani.


Optik ◽  
2021 ◽  
Vol 247 ◽  
pp. 167874
Author(s):  
V. Lakshmi Savithri Vatsalya ◽  
G. Sunita Sundari ◽  
Ch.S.L.N. Sridhar ◽  
Ch.S. Lakshmi

Author(s):  
Jae‐Hyeon Cho ◽  
Yu Jin Kim ◽  
Su Hwan Kim ◽  
Youn‐Jin Lee ◽  
Jun‐Yong Choi ◽  
...  

Author(s):  
Hafza Murtaza ◽  
Aasia Sikander ◽  
Umema Murtaza ◽  
Ashir Masroor ◽  
Filza Ghafoor

A study was designed to investigate the presence of nanoferrites in Cryptolepis buchanani. In this study, various leaves and stem organic extracts were prepared separately using the solvents viz., n-hexane, ethyl acetate, ethanol and water. Different phytochemical tests for alkaloids, carbohydrates, oils, amino acids and others were performed to determine their presence in the extracts. These plant extracts were used for screening of sample via UV and HPLC techniques to compare the wavelength and absorbance, and retention time on chromatogram by extracts, respectively. The results showed the presence of alkaloids, carbohydrates and proteins in all the samples. However, other compounds were present randomly. Spectroscopy showed highest peaks with ethyl acetate extracts and the lowest with water. The surface properties and size of nickel-zinc nano ferrites were evaluated by Energy-dispersive X-ray spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The former, showed the presence of nickel (Ni) and zinc (Zn) weighing 4.27⁒ of N ,6.89⁒ of C and 35.5⁒ of O in the sample which confirmed the presence of nano ferrites in leaves and stem of C. buchanani.


2021 ◽  
pp. 189-217
Author(s):  
A. Kaur

Nanotechnology, when this word comes in mind, it gives deep thought of new development in communication, medical science, intelligent transport system and many more. Ferrites nanoparticles have great significance owing to their amazing chemical and physical properties. In modern era we are developing materials for microwave applications and communication devices. Before the discovery of semiconductor memory chips, ferrites were the major form for electronic memory used in computers. Scientist have been studying and working with nanoparticles in magnetically guided drug delivery. The reactivity of material increases by the use of nanoparticles of that material. The dielectric characteristics of ferrites lean on diverse factors for instance methods of preparations and chemical composition. In various studies it has been found that their conductivity has dependence on temperature, composition and frequency. Among the various kinds of ferrites, Ni–Zn ferrites are viewed as the most adaptable ferrites as a result of their novel characteristics for applications at high frequency. The Ni-Zn ferrites are exploited as core materials in a variety of EM devices as well as have broad range of industrial applications e.g. inductors, microwave devices, power supplies, high and low frequency transformer cores, electromagnetic interference (EMI) suppressions and antenna rods. These broad ranges of applications are owing to their high resistivity, low eddy currents, high saturation magnetization, chemical stability and high Curie temperature. In view of this, the present chapter deals with the research progress on nickel-zinc ferrites in the bulk as well as nano size.


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